PowerDsine IEEE802.3 - Manual (Page 6)

PowerDsine Presentation October 2005 Page 6
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PoEp minimum voltage
„ Let us look on this issue under another angle assume minimum load need
to be delivered to PD by four pair is 40W
„ Power dissipation on a cables for 51V PSE will be 2.45W less then for 44V
„ Advantages of higher voltage is increase with increasing power level
0.89 0.84 System efficiency
for ~500W PSE PS
44.88W 47.52W PSE power
4.85W 7.3W Power dissipation
on a cables (4P)
0.44A 0.54A Current per pair
40W 40W Pd power
51V 44V